Single conductors straight to service panel from outside

Hi,

I am hooking up a portable generator behind my shed (about 50 ft from the house). So far, I've buried the four single conductor #10 THHN/THWN wires in a 1" conduit from the house to shed. Seemed easy enough, except for all the rocks in my way ;-).

My question is about coming back into the house. I was told by a couple Home Depot guys that I have to terminate it in a box and run Romex to the panel. The panel is directly below the entry point. I came in directly adjacent to the main service entry to the house, which is a big 2"+ conduit straight into the service panel. Being lazy, I would like to just run the single conductors straight down to the panel (about 30" ), or do I need to put it a box? If so, what type of box. None I find have 1" entry for conduit AND Romex type outputs. Any guidance would be appreciated.

Single conductors straight to service panel from outside

Hi jbfan,

So can I use any surface mount box and just drill out the back to bring in the conduit stub? I didn't see much in the way of suitable boxes other than steel. Looks hard to put a 1" hole in it and the blue plastic variety don't seem to come in surface mount. I saw a PVC outdoor box 4x4x2 with flanges but no holes. Would this work? Just drill my own holes?